Using json Object as value in a map

[FATEDx]

I have a map, that have key string, and json as the value
std::map<std::string, json> mList;
Then,
std::map<std::string, json>::iterator i = mList.at(name);
std::map<std::string, json>::iterator end = mList.end();

When i try to access the iterator, it keep giving me error about
Error C2338 could not find from_json() method in T's namespace

I have no idea what is going on, can someone help?

[nlohmann]

std::map<std::string, json>::iterator i = mArchetypeList.at(name); calls at which returns a reference and not an iterator. Can you provide a detailed error message?

[nlohmann]

Can you also provide the code in gameobjectfactory.cpp(334) and maybe some context lines?

[FATEDx]

Oh dear, i found my mistake. Sorry.
I would like to ask if storing all the data in the json object in this manner, will if have any effiency problem?

[nlohmann]

Under the hood, objects are stored in an std::map. Each value has some overhead (a few pointer), but basically it should not make things too bad.

[FATEDx]

Alright Thank you so much! This is very helpful